Characterization of Atmospheric Aerosol over XiAn in the South Margin of the Loess Plateau, China

Abstract. Slope aspect is an important topographic factor, but its effect on the microbial properties of grassland rhizospheric soil (RS) and non-rhizospheric soil (NRS) remain unclear. A field experiment was conducted at the Ansai Research Station on the Loess Plateau in China to test the influence of slope aspects (south-facing, north-facing, and northeast-facing slopes, all with Artemisia sacrorum as the dominant species) on RS and NRS microbial biomass carbon (MBC) and phospholipid fatty acid (PLFA) contents, and the rhizospheric effect (RE) of various microbial indices. MBC content differed significantly among the slope aspects in RS but not in NRS, and RE for MBC content in the south-facing slope was larger than that in the north-facing slope. RS total, bacterial, and gram-positive bacterial PLFA contents in the south-facing slope were significantly lower than those in the north- and northeast-facing slopes, and RS gram-negative bacterial (G-) and actinomycete PLFA contents in the south-facing slope were significantly lower than those in the north-facing slope. Differently, NRS total, bacterial, and G- PLFA contents in the north-facing slope were significantly higher than those in the south- and northeast-facing slopes, and NRS fungal and actinomycete PLFA contents in the north- and south-facing slopes were significantly higher than those in the northeast-facing slope. RE for all PLFA contents except fungal in the northeast-facing slope were higher than those in the south-facing slope. Slope aspect significantly but differentially affected the microbial properties in RS and NRS, and the variable influence was due an evident RE for most microbial properties.

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Spatial distribution of water-active soil layer along the south-north transect in the Loess Plateau of China

Journal of Arid Land ◽

10.1007/s40333-019-0051-4 ◽

2019 ◽

Vol 11 (2) ◽

pp. 228-240 ◽

Cited By ~ 4

Author(s):

Chunlei Zhao ◽

Ming’an Shao ◽

Xiaoxu Jia ◽

Laiming Huang ◽

Yuanjun Zhu

Keyword(s):

Spatial Distribution ◽

Loess Plateau ◽

Soil Layer ◽

The Loess Plateau ◽

The South

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Characterization of rhizobia isolated from legume species within the genera Astragalus and Lespedeza grown in the Loess Plateau of China and description of Rhizobium loessense sp. nov.

INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY ◽

10.1099/ijs.0.02031-0 ◽

2003 ◽

Vol 53 (5) ◽

pp. 1575-1583 ◽

Cited By ~ 60

Author(s):

Ge Hong Wei ◽

Zhi Yuan Tan ◽

Ming E Zhu ◽

En Tao Wang ◽

Su Zhen Han ◽

...

Keyword(s):

Loess Plateau ◽

Legume Species ◽

The Loess Plateau

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Chemical profiles of urban fugitive dust over Xi'an in the south margin of the Loess Plateau, China

Atmospheric Pollution Research ◽

10.5094/apr.2014.049 ◽

2014 ◽

Vol 5 (3) ◽

pp. 421-430 ◽

Cited By ~ 40

Author(s):

Qian Zhang ◽

Zhenxing Shen ◽

Junji Cao ◽

KinFai Ho ◽

Renjian Zhang ◽

...

Keyword(s):

Loess Plateau ◽

Fugitive Dust ◽

The Loess Plateau ◽

The South ◽

Chemical Profiles

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Influence of slope aspect on the microbial properties of rhizospheric and non-rhizospheric soils on the Loess Plateau, China

Solid Earth ◽

10.5194/se-9-1157-2018 ◽

2018 ◽

Vol 9 (5) ◽

pp. 1157-1168 ◽

Cited By ~ 3

Author(s):

Ze Min Ai ◽

Jiao Yang Zhang ◽

Hong Fei Liu ◽

Sha Xue ◽

Guo Bin Liu

Keyword(s):

Loess Plateau ◽

Phospholipid Fatty Acid ◽

Slope Aspect ◽

Research Station ◽

Rhizospheric Soil ◽

The Loess Plateau ◽

The South ◽

Microbial Properties ◽

The North ◽

Microbial Indices

Abstract. Slope aspect is an important topographic factor in the micro-ecosystem environment, but its effect on the microbial properties of grassland rhizospheric soil (RS) and non-rhizospheric soil (NRS) remain unclear. A field experiment was conducted at the Ansai Research Station on the Loess Plateau in China to test the influence of slope aspects (south-facing, north-facing, and northwest-facing slopes, all with Artemisia sacrorum as the dominant species) on RS and NRS microbial biomass carbon (MBC) contents, phospholipid fatty acid (PLFA) contents, and the rhizospheric effect (RE) of various microbial indices. Soil samples were collected from the three slope aspects, including rhizospheric and non-rhizospheric region, and analyzed to determine the various related microbial indices. The results showed that MBC content differed significantly among the slope aspects in RS but not in NRS, and the RE for MBC content in the south-facing slope was larger than that in the north-facing slope. RS total, bacterial, and Gram-positive bacterial PLFA contents in the south-facing slope were significantly lower than those in the north- and northwest-facing slopes, and RS Gram-negative bacterial (G−) and actinomycete PLFA contents in the south-facing slope were significantly lower than those in the north-facing slope. In contrast, NRS total, bacterial, and G− PLFA contents in the north-facing slope were significantly higher than those in the south- and northwest-facing slopes, and NRS fungal and actinomycete PLFA contents in the north- and south-facing slopes were significantly higher than those in the northwest-facing slope. RE for all PLFA contents except fungal in the northwest-facing slope were higher than those in the south-facing slope. Slope aspect significantly but differentially affected the microbial properties in RS and NRS, and the variable influence was due to an evident RE for most microbial properties.

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Characterization of DOC and CDOM and their relationship in turbid waters of a high-altitude area on the western Loess Plateau, China

Water Science & Technology ◽

10.2166/wst.2020.004 ◽

2019 ◽

Vol 80 (9) ◽

pp. 1796-1806 ◽

Cited By ~ 1

Author(s):

Tiantian Shao ◽

Tao Wang ◽

Xiaowen Liang ◽

Honglian Xu ◽

Liuyang Li

Keyword(s):

Loess Plateau ◽

Yellow River ◽

Anthropogenic Activity ◽

The Loess Plateau ◽

Water Parameters ◽

Turbid Waters ◽

High Altitude Area ◽

Linear Regressions ◽

Western Loess Plateau

Abstract Dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in rivers and reservoirs on the western Loess Plateau, which is an area of severe soil erosion, were investigated in September 2017 to analyze the CDOM characteristics and composition, DOC distribution and influence of environmental factors on these parameters. Great differences of water parameters were exhibited between different groups based on the analysis of variance (p < 0.01). The results indicated that rivers exhibited higher DOC concentrations (mean: 3.70 mg/L) than reservoir waters (mean: 2.04 mg/L). Artificial and agricultural lands exert a large influence on DOC concentrations, which verifies the hypothesis that intense anthropogenic activity results in high DOC concentrations. The CDOM absorption at 350 nm [aCDOM(350)] of tributary water samples was 2.73 m−1, which was higher than that in the Yellow River (1.71 m−1) and reservoir waters (1.33 m−1). The effects of DOC, TC and turbulence (Tur) on CDOM are positive and significant (p < 0.05) according to the multiple linear regressions. An analysis of the optical characteristics of CDOM indicated that waters on the Loess Plateau contained abundant humic acid and higher levels of allochthonous DOM with a higher molecular weight (MW) based on the spectral slopes (S) and specific UV absorbance (SUVA254) values.

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